Some of u are blaming getting older for overpopulation and yes of course it adds up but u should also look at the fertility rate. In Niger women have 7 children, in Macao only 1. Half of the world's population growth will be in Africa. Should we stop living healthy and die sooner because the birth rate elsewhere is out of control? No, it's better to improve living conditions, maybe have some birth control, so the population growth goes down.
At the current state there will be never something like birth control out of different reasons. China tried it and failed with it. Reason? People wanted more children, or wanted to get a son instead of a daughter so they killed sometimes their daughters after birth or other things.
I also assume that it is hard to make something like birth control because how do you want to control it? And when someone has more children how do you want to punish them? Prison? A fine?
Humanity in a whole is too stupid to see their own mistakes and problems until it is too late.